go - json -struct

package main
//json 与struct转化
import (
	"encoding/json"
	"fmt"
)
// 结构体首字母要大写打印出来后给的别名
type People struct {
    
    
	Name string `json:"name_title"`
	Age int `json:"age_size"`
}
//struct 转json
func StructToJsonDemo() {
    
    
	p := People{
    
    
		Name: "alpha",
		Age:  18,
	}
	jsonBytes, err := json.Marshal(p) //结构体转json序列化
	if err != nil {
    
    
		fmt.Println(err)
	}
	fmt.Println(string(jsonBytes))
}
//json转化为结构体
func JsonToStructDemo(){
    
    
	jsonStr := `
        {
                "name_title": "alpha"
                "age_size":12
        }
        `
	var people People
	json.Unmarshal([]byte(jsonStr), &people)
	fmt.Println(people.Age,people.Name)
}


// json转map

func JsonToMapDemo(){
    
    
	jsonStr := `
        {
                "name": "alpha",
                "age": 18
        }
        `
	var mapResult map[string]interface{
    
    }//传地址才会修改该map
	err := json.Unmarshal([]byte(jsonStr), &mapResult)
	if err != nil {
    
    
		fmt.Println("JsonToMapDemo err: ", err)
	}
	fmt.Println(mapResult)
}
//map转json

func MapToJsonDemo(){
    
    
	mapInstances := []map[string]interface{
    
    }{
    
    }
	instance_1 := map[string]interface{
    
    }{
    
    "name": "John", "age": 10}
	instance_2 := map[string]interface{
    
    }{
    
    "name": "Alex", "age": 12}
	mapInstances = append(mapInstances, instance_1, instance_2)

	jsonStr, err := json.Marshal(mapInstances)

	if err != nil {
    
    
		fmt.Println("MapToJsonDemo err: ", err)
	}
	fmt.Println(string(jsonStr))
}

func main()  {
    
    
	StructToJsonDemo()
	StructToJsonDemo()
	JsonToMapDemo()
	MapToJsonDemo()

}